Installing and running on x86-64
From OpenSimulator
This is what I have managed to gather about running OpenSimulator on an Intel Core2 on a 64bit linux system.
To install it you need to do:
svn co http://opensimulator.org/svn/opensim/trunk opensim
cd opensim
sh runprebuild.sh
nant
cd ..
svn co svn://openmetaverse.org/libsl/trunk libsl
cd libsl/openjpeg-libsl/
nano Makefile (add -m64 to compile flags to avoid another segfault)
make
cp libopenjpeg-libsl-2.1.2.0.so ../../opensim/bin/libopenjpeg-libsl-2.1.2.0-x86_64.so
cd ../../opensim/bin/
cp OpenSimulator.ini.example OpenSimulator.ini
mono OpenSimulator.exe
Unfortunately this results in a segmentation fault. Which is somewhat remedied by building the libsl libraries by hand and copying the dll's from the freshly built libsl to the OpenSimulator bin/ folder. This makes us get one step further. Unfortunately (Again) at this point we get other problems as apparently OpenSim is not compatible with the new libsl. I am yet to find a solution to this.